Arizona Real Estate License Practice Exam 2025 - Free Real Estate Practice Questions and Study Guide

Radon is a naturally occurring radioactive gas that is formed from the decay of uranium and thorium, which are found in soil, rock, and groundwater. This process involves the breakdown of these heavy elements, and as they decay, radon is released into the surrounding environment. Because radon is gas, it can migrate through soil and enter buildings through cracks in floors and walls, construction joints, and gaps around service pipes.

The presence of radon is significant due to its potential health risks, particularly its association with lung cancer. In many areas, especially those with high uranium content in the soil, monitoring radon levels is an important part of maintaining safe living environments.

In contrast, while asbestos and lead can be found in certain geological formations, they are not products of radioactive decay. Asbestos is a mineral fiber that was historically used in building materials due to its fire resistance, while lead is a heavy metal that can come from various sources, including deteriorating paint, plumbing, and contaminated soil, but is not a decay product. Carbon monoxide, on the other hand, is a colorless, odorless gas that is produced by the incomplete combustion of carbon-containing fuels, unrelated to natural radioactive decay processes.

Thus, radon's formation